Watchmaker&#39;s pliers



Dec. 8, 1953 y. A. NORVILL 2,661,646

WATCHMAKERS PLIERS Filed Aug. 21, 1951 IN V EN TOR. V/cra/e A A olev/LL,4 r TORNEY ?aiented Dec. 8, 1953 UNITED STATES ATENT OFFICE WATCHMAKERSPLIERS Victor A. Norvill, Pequabock, Conn.

Application August 21, 1951, Serial No. 242,834

1 Claim.

This invention relates to watchmakers tools, and more particularly to atool or pliers comprising a pair of pivoted handles for detachablyclamping a cannon pinion, a roller, a jewel, a second or minute hand, acrown, a hair spring, etc., in order to permit the latter to betightened or removed.

One object of the invention is to provide a watchmakers tool of theabove nature having an adjusting screw whereby the pressure exerted onthe pinion or other article clamped thereby may be varied.

A further object is to provide a watchmakers tool of the above nature inwhich the adjusting screw is provided with an associated circularindicating scale and index to show the degree of adjustment of thescrew.

A further object is to provide a device of the above nature which issimple in construction, inexpensive to manufacture, easy to install andmanipulate, compact ornamental in appearance, and very efficient anddurable in use.

With these and other objects in view there has been illustrated on theaccompanying drawing one form in which the invention may conveniently beembodied in practice.

In the drawing:

Fig. 1 represents a side view of the watchmakers pliers embodying theinvention.

Fig. 2 is a top plan view of the same.

Fig. 3 is an end view of the same, on a larger scale, looking at theclamping jaws.

Fig. 4 is an enlarged cross-sectional view, taken along the line 4--6 ofFig. 1, looking in the direction of the arrows.

Referring now to the drawing, in which like reference numerals denotecorresponding parts throughout the several views, the numerals Ill and lI indicate generally the jaws of the watchmakers tool, comprising a pairof handles i 2, I3, pivoted together by a pivot pin l3a, and providedwith T-shaped clamping members l4, l5 at the end thereof, opposite fromsaid handles. Each of the clamping members l4, I5 is provided with aseries of opposed complementary semicircular recesses l6, ltd, ll, Ila,l8, 18a, l9, l9a, which are adapted to clamp around the article engagedby the pliers.

The numeral 20 indicates a coiled spring for normally holding the jaws10, l in clamping position, said spring being provided with hooked ends2!, 22 for engaging the exterior of the handles l2, l3.

In order to limit the pressure upon the cannon pinion or other memberbeing clamped by the tool, provision is made of an adjustable screw 23rotatably mounted in a tapped hole 24 in the jaw l I and having aknurled handle knob 25 for convenience in manipulation.

Provision is also made of a circular ring scale 26 graduated with crosslines for reference with an index arm 2'1 mounted on the jaw II, forvisibly indicating the adjustment of the screw 23. The circular ringscale 26 is located in a rectangular recess 28 between the adjacenthandles l0, ll.

Operation In operation, when the user desires to clamp a cannon pinionor other article by the pliers, the handles l2, It will be moved to openposition and the cannon pinion inserted between a pair of semi-circularrecesses 56, ltd, ll, Ha, l8, Ida, I 9, I912. The handles will then bereleased, whereupon the spring 26 will press the clamping memberstogether upon the work. The pressure upon the work held by the clampingjaws may be readily adjusted by manipulating the knob 25, and the amountof said pressure may be readily determined by visual observation of therelative position of the index arm 2? and graduated scale 26.

While there has been disclosed in this specification one form in whichthe invention may be embodied, it is to be understood that this form isshown for the purpose of illustration only and that the invention is notto be limited to the specific disclosure but may be modified andembodied in various other forms without departing from its spirit. Inshort, the invention includes all the modifications and embodimentscoming within the scope of the following claim.

Having thus fully described the invention, what is claimed as new, andfor which it is desired to secure Letters Patent, is:

In a watehmakers pliers, a pair of crossed plier handles pivotedtogether between their ends and having work-engaging jaws at one endthereof, a coil spring between said handles for pressing said jawsagainst the work located therebetween, a stop screw rotatably mountedwithin a tapped hole in one of said handles, said screw having amanipulating knob at its outer end and having its inner end engaging theother of said handles to limit the pressure which may be exerted uponthe work by said jaws, said screw having an intermediate graduated ringfixed thereon between said handles, and an index pointer on one of saidhandles adjacent and overlying said ring and located at right anglesthereto to indicate on said ring the exactadjustmeht of said stop screw.

VICTOR, A. NO-RVILL.

UNITED STATES PATENTS References Cited in the file of this patent NumberName Date 419,272 Low Jan. 14, 1890 978,317 Lutz Dec. 13, 1910 1,564,960Horsman Dec, 8, 1925 1,674,644 Helfgott June 26, 1928 1,725,613 BoltAug. 20, 1929

